I believe its the same size, so most likely. Don't hold me to that though. I've never played with .260. But I have heard that a bcg that is already worn from one rifle will cause excessive wear or damage in a new upper since the surfaces won't mate correctly. I've never tried it, but just hearing it made me buy a new bcg when I got a new upper.

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”Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars.” ~Unknown

I rebarreled an AR10 to .260. Not sure I would do it again. The .260, in a gas gun, does not perform the same way it does in a bolt gun. Different powders and bullets will give better accuracy and the factory ammo is made for the bolt guns too. The pressures are higher at the same point down the barrel so you are even more over-gassed than with the .308. If you do it, you definately want adjustable gas, and plenty of patience working up loads. You will also want to shoot 140s and 142s, but if so, you need even more patience. The 123s and 130 were more accurate with better pressure curves too. Due to these issues, the barrel wear is faster than the comparable cartidges and only slightly less than a .243 in a gas gun.

Don't get me wrong, I LOVE the .260 Rem cartidge. If I wanted a long range gas gun, I would go with the 6.5 Creedmore or the 7mm-08 instead. The Creedmore is a slightly shorter case so you don't lose case capacity and get better accuracy with the longer bullets. The 7mm-08 is slightly larger in diameter which helps with the gas pressure issues.

The .243, .260 Rem, 7mm-08, .308 and .338 Federal are all based on the .308 Win case.

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